The ice nihil is a member of the nihil race, created by Zaros during his testing of genetic manipulation. By its examine, the ice nihil was likely created by weaving the essence of an icyene.

Players also see an ice nihil momentarily during the trek through Freneskae, darting briefly through a hole in a wall after players pass a ledge. It is fought in The Pit alongside the other nihils.

The ice nihil, like the other nihil in the arena, run across the halls and into holes in the wall, causing damage to and draining prayer points from any players that stand in its way. It always runs south, appearing from a different hole each time, until the player attacks it and draws its attention, at which point it solely focuses on using magic.

The ice nihil always drains 50 prayer points from the player, regardless of how much damage is done. As the ice nihil has 100% accuracy, power armour is advised over tank to kill it faster. Every 8 auto attacks the ice nihil will say "Hiss.", which will stun and freeze the player for six seconds. This stun/bind can be removed with Freedom; Anticipation can be used in advance to completely stop the stun and freeze effects.

For players obtaining "the Annihilator" title, it is recommended to kill the ice nihil first once all four nihil are attacking the player as it has more troublesome effects compared to the other nihil.

After the quest, the nihils may be fought for their drops. They are aggressive unless the Shard of Zaros is equipped.